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Poly88: fixed timing issue when loading a snapshot. Added notes.

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This commit is contained in:
Robbbert 2016-07-03 23:30:53 +10:00
parent 711eb65ece
commit 4dee62bc85
1 changed files with 19 additions and 1 deletions
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20
src/mame/drivers/poly88.cpp
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@ -6,6 +6,24 @@
18/05/2009 Initial implementation
Poly-88 ToDo:
MT 06231: Cassette saving hangs. Also, the system has different
formats depending on a switch. Only one format is currently
emulated.
Poly-8813 is a disk-based computer with 3 mini-floppy drives.
Booting is done by pressing the "Load" button, mounted on the
front panel near the power switch. Although user manuals are easy
to obtain, technical information and schematics are not. The bios
makes use of illegal instructions which we do not correctly emulate.
The first of these is at 0x006A (print a character routine), while
the other is at 0x0100 (an internal copy routine). The code at 0x100
can be replaced by 7E 12 13 23 03 79 B0 C2 00 01 C9, which exactly
fits into the available space. The disk format is known to be
256 bytes per sector, 10 sectors per track, 35 tracks, single sided,
for a total of 89600 bytes.
****************************************************************************/
#include "emu.h"
@ -194,7 +212,7 @@ static MACHINE_CONFIG_START( poly88, poly88_state )
MCFG_I8251_RXRDY_HANDLER(WRITELINE(poly88_state,poly88_usart_rxready))
/* snapshot */
MCFG_SNAPSHOT_ADD("snapshot", poly88_state, poly88, "img", 0)
MCFG_SNAPSHOT_ADD("snapshot", poly88_state, poly88, "img", 2)
MACHINE_CONFIG_END
static MACHINE_CONFIG_DERIVED( poly8813, poly88 )